asix-sigma: Only download firmware when necessary

[libsigrok.git] / src / hardware / asix-sigma / protocol.c

diff --git a/src/hardware/asix-sigma/protocol.c b/src/hardware/asix-sigma/protocol.c
index 98cfce7a185b1b4dd45a2940b372a04b227a5fd2..253e98a0aa5349c58a3babff447f3af1b20776db 100644 (file)
--- a/src/hardware/asix-sigma/protocol.c
+++ b/src/hardware/asix-sigma/protocol.c
@@ -442,10 +442,18 @@ static int upload_firmware(struct sr_context *ctx,
        unsigned char *buf;
        unsigned char pins;
        size_t buf_size;
-       const char *firmware = sigma_firmware_files[firmware_idx];
-       struct ftdi_context *ftdic = &devc->ftdic;
+       const char *firmware;
+       struct ftdi_context *ftdic;
+
+       /* Avoid downloading the same firmware multiple times. */
+       firmware = sigma_firmware_files[firmware_idx];
+       if (devc->cur_firmware == firmware_idx) {
+               sr_info("Not uploading firmware file '%s' again.", firmware);
+               return SR_OK;
+       }
 
        /* Make sure it's an ASIX SIGMA. */
+       ftdic = &devc->ftdic;
        ret = ftdi_usb_open_desc(ftdic, USB_VENDOR, USB_PRODUCT,
                                 USB_DESCRIPTION, NULL);
        if (ret < 0) {